gpu: nvgpu: scale ptimer based timeouts

bug 1603226

host based timeouts use ptimer for detecting
timeouts. on gk20a and gm20b ptimer runs 2.6x
slower. scale the fifo_eng_timeout to account
for this

Change-Id: Ie44718382953e36436ea47d6e89b9a225d5c2070
Signed-off-by: Vijayakumar <vsubbu@nvidia.com>
Reviewed-on: http://git-master/r/799983
(cherry picked from commit d1d837fd09ff0f035feff1757c67488404c23cc6)
Reviewed-on: http://git-master/r/808250
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index f107d83d..8290e7e7 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -886,4 +886,11 @@ void gk20a_user_deinit(struct platform_device *dev);
 
 extern void gk20a_debug_dump_device(struct platform_device *pdev);
 
+static inline u32 scale_ptimer(u32 timeout , u32 scale10x)
+{
+        if (((timeout*10) % scale10x) >= (scale10x/2))
+                return ((timeout * 10) / scale10x) + 1;
+        else
+                return (timeout * 10) / scale10x;
+}
 #endif /* GK20A_H */